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Determination of optimum gradation for resistance to permeability, rutting and fatigue cracking

99
5.5.2 RSCH Test Results for 9.5mm Mixtures
Table 5.19 provides the shear strains of 9.5mm mixtures in unconditioned as well as
conditioned states. In Figures 5.14 and 5.15, the change of plastic shear strain with
number of loading cycles is plotted for unconditioned and conditioned specimens,
respectively. A comparison of shear strains is shown in Figure 5.16.
The results of 9.5mm mixture indicate that the shear strains of mixtures with high
permeability of unconditioned specimens are higher than the other mixtures. The
mixtures of low permeability have lower shear strains than the field cores and the mixture
of unmodified gradation. The results of conditioned specimens show that mixtures of
high permeability have higher shear strains than other mixtures. The mixtures L1 and L2
have lower shear strains than other mixtures in conditioned state too. The field cores and
the mixture of unmodified gradation have shear strains in between low permeable and
high permeable mixtures.
The shear strains of conditioned specimens are higher than the shear strains of the
unconditioned specimens. The increase in shear strain indicates the loss in shear strength
of the mixtures due to the damage induced during the conditioning. The increase in shear
strain due to conditioning is higher in the mixtures of low permeability than in the
mixtures of high permeability. In spite of a greater increase in shear strain as observed in
low permeable mixtures due to conditioning, the shear strains of mixtures L1 and L2 are
lower than the mixtures H1 and H2.

99
5.5.2 RSCH Test Results for 9.5mm Mixtures
Table 5.19 provides the shear strains of 9.5mm mixtures in unconditioned as well as
conditioned states. In Figures 5.14 and 5.15, the change of plastic shear strain with
number of loading cycles is plotted for unconditioned and conditioned specimens,
respectively. A comparison of shear strains is shown in Figure 5.16.
The results of 9.5mm mixture indicate that the shear strains of mixtures with high
permeability of unconditioned specimens are higher than the other mixtures. The
mixtures of low permeability have lower shear strains than the field cores and the mixture
of unmodified gradation. The results of conditioned specimens show that mixtures of
high permeability have higher shear strains than other mixtures. The mixtures L1 and L2
have lower shear strains than other mixtures in conditioned state too. The field cores and
the mixture of unmodified gradation have shear strains in between low permeable and
high permeable mixtures.
The shear strains of conditioned specimens are higher than the shear strains of the
unconditioned specimens. The increase in shear strain indicates the loss in shear strength
of the mixtures due to the damage induced during the conditioning. The increase in shear
strain due to conditioning is higher in the mixtures of low permeability than in the
mixtures of high permeability. In spite of a greater increase in shear strain as observed in
low permeable mixtures due to conditioning, the shear strains of mixtures L1 and L2 are
lower than the mixtures H1 and H2.